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【单选题】
Research indicates that _____ 75% of kids with learning disabilities have such difficulties as making and keeping friends. [ ]A.
as much as
B.
as long as
C.
as many as
D.
as far as
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举一反三
【单选题】I’m hoping to buy an apartment __________________$ 12,000.
A.
in the neighborhood for
B.
in neighborhood for
C.
in the neighborhood of
D.
in neighborhood of
【单选题】I’m hoping to buy an apartment __________________$ 12,000.
A.
in the beighborhood of
B.
in neighborhood of
C.
in neighborhood for
D.
in the neighborhood for
【简答题】组合电路没有记忆功能，因此，它是由（）组成。
【单选题】I’m hoping to buy an apartment __________________$ 12,000.
A.
in the neighborhood of
B.
in neighborhood of
C.
in neighborhood for
D.
in the neighborhood for
【多选题】设(X,Y)的联合分布律为【图片】已知 a:b:c = 1:2:3,则以下结果正确的是
A.
P(Y>0)=0.4
B.
E(Y)=0.6
C.
P(X=0 ︱ Y= -1)=0.1
D.
E(XY)=0.1
E.
D(X)=0.24
F.
X 与 Y 不相关
【多选题】设(X,Y)的联合分布律为【图片】,已知P(X=2)=0.6, P(Y≤1)=0.7,则以下结果正确的是
A.
a=0.2 , b=0.3
B.
E(X)=1.2
C.
E(Y)=1
D.
a=0.1
E.
c 不确定
F.
P(X=0 ︱ Y=0)=0.5
G.
E(XY)=0.8
H.
E(X)=1
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